WO2021251502A1

WO2021251502A1 - Thermoforming device and thermoforming method

Info

Publication number: WO2021251502A1
Application number: PCT/JP2021/022473
Authority: WO
Inventors: 憲一溝口; 章伍高井; 一典寺本
Original assignee: 株式会社浅野研究所
Priority date: 2020-06-12
Filing date: 2021-06-14
Publication date: 2021-12-16
Also published as: JP6852933B1; JP2021194834A; CN115298013A

Abstract

A thermoforming device (10) comprising an upper mold (37) and a lower mold (33) as molding dies and whereby a resin molding sheet (S) is interposed between the upper mold (37) and the lower mold (33) and molded. The thermoforming device (10) has a sheet pressing section (37a) provided so as to protrude from the molding surface of either the upper mold (37) or the lower mold (33). The sheet pressing section (37a) has a function that, together with the molding surface of the other molding die, sandwiches a transparent section (M1) which is a section of the resin molding sheet (S) that forms part of the molded product (M) after molding. The resin molding sheet (S) is molded by the rest of the resin molding sheet (S), other than the transparent section (M1), being sandwiched by the upper mold (37) and the lower mold (33).

Description

Thermoforming equipment and thermoforming method

The present invention relates to a technique capable of molding a resin molded sheet using a thermoforming apparatus without leaving a strain generated during molding of the resin molded sheet at a specific portion of the molded product.

When molding a resin sheet using a thermoforming device, there is a method of pressurizing using an upper mold and a lower mold as molding dies to deform and mold the heated resin sheet. Molding is performed by sandwiching a resin sheet softened by heating between an upper mold and a lower mold and pressurizing it. For example, it is a method as shown in Patent Document 1.

Patent Document 1 discloses a technique relating to a mold clamping device and a mold clamping method. The sheet sandwiched between the upper edge of the frame and the lower edge of the frame is heated and softened, and the plug corresponding to the upper mold is brought close to the female mold corresponding to the lower mold, and the resin molded sheet held between them. It is configured to mold. At this time, the resin molded sheet is held so as not to move by pressing the resin molded sheet against the lower table side by the gripping member provided on the upper table side.

Japanese Patent No. 3602051

However, even when the technique described in Patent Document 1 is used, depending on the shape of the molding die, distortion may occur inside the molded product when molding the resin sheet, and as a result, the molded product may be distorted. There was a problem that it affected the function of the product using. For example, when the resin sheet used for molding is a thick sheet, it is molded into a target shape because it is molded using a mold, but there is a problem that distortion remains inside. There is a concern that the strain remaining inside may affect the function of the product when the molded product becomes a product.

To give a specific example, for example, a molded product is used as a cover for a car navigation system attached to an automobile, and this cover has a transparent part used as an operation window. Even if the distortion of the molded product cannot be visually confirmed, directional distortion may be formed inside the molded product, and when you look at the car navigation screen through a lens that uses polarized glasses such as sunglasses, it is one of the displays. The applicant has confirmed that there are cases where the part appears to be missing. Further, when an LED backlight or the like is used for the display screen, interference fringes may appear due to the influence of internal distortion. Since there are cases where the distortion remaining inside the molded product becomes a problem in this way, countermeasures are required.

Therefore, an object of the present invention is to solve such a problem and to provide a thermoforming apparatus and a thermoforming method capable of forming so that internal strain does not remain in a specific portion.

In order to achieve the above object, the thermoforming apparatus according to one aspect of the present invention has the following features.

(1) In a thermoforming apparatus having an upper mold and a lower mold as a molding mold and sandwiching a heated resin sheet between the upper mold and the lower mold, either the upper mold or the lower mold is used. It has a pressing means provided so as to protrude from the molding surface on one side, and the pressing means forms a specific portion of the resin sheet that becomes a part of the product after molding on the other side of the molding mold. It has a function of sandwiching with a surface, and is characterized in that a portion other than the specific portion of the resin sheet is sandwiched between the upper mold and the lower mold to form the resin sheet.

(2) In the thermoforming apparatus according to (1), the specific portion is a transparent portion when the resin sheet becomes a product.

According to the embodiment described in (1) above, by adopting a method of molding with a molding die while pressing a specific portion of the resin sheet, it is difficult to accumulate internal strain inside the pressed portion. Can be done. Therefore, as in the embodiment described in (2), when a specific portion is a transparent portion, light is polarized and transmitted due to the influence of distortion, which causes a problem as a product. Therefore, by first pressing the specific portion with the pressing means and then molding, it is possible to prevent the occurrence of internal distortion, interference fringes, and the like. Therefore, it is possible to make a product in which the transparent portion remains transparent.

(3) The thermoforming apparatus according to (1) or (2) includes a drive mechanism for raising and lowering at least one of the upper mold and the lower mold, and a control device for controlling the drive mechanism. With the lower mold closed, position control or torque control is performed by a control device that controls the drive mechanism to control the position of the lower mold with respect to the upper mold.

Since the position of the lower mold with respect to the upper mold can be controlled by the drive mechanism according to the embodiment described in (3) above, the clearance of the lower mold with respect to the upper mold when the mold is closed is controlled, and the molding condition of the molded product is adjusted. can do. Here, the raising and lowering of the upper die or the lower die by the drive mechanism has a function of fixing one of the upper die or the lower die and bringing the other close to each other, or both close to each other. This makes it possible to control the clearance of the lower mold with respect to the upper mold, for example, according to the material and thickness of the resin sheet. By doing so, it is possible to adjust the finished product of the molded product, and thus it is possible to improve the molding accuracy.

(4) In the thermoforming apparatus according to (1), the specific portion is characterized in that an air pool is likely to occur during molding.

According to the aspect described in (4) above, it is possible to prevent the occurrence of defects due to the air accumulation by pressing the portion where the air accumulation is likely to occur during molding by the pressing means. Depending on the shape of the molding mold, for example, if the shape is recessed like a bowl, air may easily collect in the bottom part, but in such a case, first press the bottom part with a pressing means to mold. Therefore, it is possible to prevent the occurrence of defective products.

Further, in order to achieve the above object, the thermoforming method according to another aspect of the present invention has the following features.

(5) In a thermoforming method in which an upper mold and a lower mold are provided as a molding mold and a heated resin sheet is sandwiched between the upper mold and the lower mold, either the upper mold or the lower mold is used. A specific portion of the resin sheet that is a part of the molded product after molding is sandwiched between the pressing means provided so as to protrude from the molding surface on one side and the molding surface of the molding mold on the other side. It is characterized in that the resin sheet is formed by sandwiching a portion other than the specific portion of the resin sheet between the upper mold and the lower mold.

According to the embodiment described in (5) above, similarly to the embodiment of the thermoforming apparatus described in (1), the molded product after molding can suppress the occurrence of internal strain in a specific portion pressed by the pressing means. can. Therefore, as in the embodiment of the thermoforming apparatus described in (2), when the specific portion is a transparent portion, internal distortion, interference fringes, etc. in the specific portion pressed by the pressing means may occur. It can be prevented from occurring. Therefore, it is possible to make a product in which the transparent portion remains transparent.

It is a side view which shows the whole outline of the thermoforming apparatus of this embodiment. It is a side view of the molding part of this embodiment. It is a perspective view explaining the drive system of the lower table of this embodiment. It is a perspective view explaining the drive system of the upper table of this embodiment. It is a side sectional view of the present embodiment in a state where the upper mold and the lower mold are close to each other. It is a schematic block diagram of the control about the molded part of this embodiment. It is a schematic diagram which shows the state that the resin molded sheet is sandwiched between the sheet pressing part and the lower mold of this embodiment. It is a schematic diagram which shows the state that the upper mold and the lower mold are brought close to each other while being pressed by the sheet pressing portion of this embodiment. It is a schematic diagram which shows the state that the upper mold and the lower mold are further brought close to each other in this embodiment. It is a schematic diagram which shows the state that the upper mold and the lower mold of this embodiment are brought into close contact with each other through a resin molded sheet. It is a schematic diagram which showed the state which sandwiched the resin molded sheet between the upper mold and the lower mold prepared for comparison. It is a schematic diagram which showed the state which the upper mold and the lower mold were close to each other prepared for comparison. It is a schematic diagram which showed the state which made the upper mold and the lower mold closer to each other prepared for comparison. It is a schematic diagram which shows the state that the upper mold and the lower mold prepared for comparison were brought into close contact with each other through a resin molded sheet. It is a perspective view schematically showing the state of molding a resin molded sheet of this embodiment.

[Outline of device configuration]
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view briefly illustrating the entire thermoforming apparatus 10 of the present embodiment. The thermoforming apparatus 10 includes a sheet heating unit 20 and a molding unit 30. The sheet heating unit 20 is a place for heating the resin molded sheet S. The resin molded sheet S cut in advance for one shot is clamped by the transfer device 50 by a clamping function (not shown) and moved to the sheet heating unit 20. In the sheet heating unit 20, the resin molded sheet S is heated and softened. Next, the resin molding sheet S is conveyed to the molding unit 30 to perform molding.

The sheet heating unit 20 is provided with an upper heater unit 21 and a lower heater unit 22 as a pair of heater units. When the resin molded sheet S clamped to the transport device 50 is transported between the upper heater unit 21 and the lower heater unit 22, the heating elements arranged in the upper heater unit 21 and the lower heater unit 22 are energized. As a result, the resin molded sheet S is heated and softened. The heating temperature is appropriately set by the material of the resin molded sheet S.

The molding unit 30 is provided with an upper table 31 and a lower table 32 that are moved up and down. The upper table 31 and the lower table 32 are configured to move up and down by ball screws (second ball screw 34 and first ball screw 35) described later, and the upper mold 37 and the lower table provided inside the upper table 31. By bringing the lower mold 33 provided in the 32 close to each other, the resin molded sheet S transported by the transport device 50 is molded.

[Structure of molded part]
Next, the configuration of the molding unit 30 will be specifically described. FIG. 2 shows a side view of the molded portion 30. The molding portion 30 is provided with a frame 36, and the upper table 31 and the lower table 32 are moved up and down in the frame 36. At the lower part of the frame 36, which corresponds to the four corners of the lower table 32, a guide rail 36a which is long in the vertical direction and has a length corresponding to the elevating stroke of the lower table 32 is provided.

FIG. 3 shows a perspective view of the drive system of the lower table 32. The lower table 32 is provided with fitting portions 32a at its four corners. The fitting portion 32a has a function of guiding the raising and lowering of the lower table 32 by fitting with the guide rail 36a shown in FIG. Further, the second ball screw 34 is arranged diagonally to the lower table 32. The second ball screw 34 is rotatably fixed to the frame 36 and is arranged so as to penetrate the lower table 32. A nut 34b is fixed to the lower table 32 at a position where the second ball screw 34 penetrates, and the nut 34b and the second ball screw 34 mesh with each other.

A second pulley 34a is attached to the upper end of the second ball screw 34, and the rotational driving force of the second servomotor 61 is transmitted to each of the second pulleys 34a via the second timing belt 34c. Therefore, the lower table 32 is configured to move up and down by the rotational drive of the second servomotor 61. A lower die 33 is fixed to the center of the lower table 32, and the lower die 33 also moves up and down as the lower table 32 moves up and down.

FIG. 4 shows a perspective view of the drive system of the upper table 31 extracted. Gripping members 31a are provided at the four corners of the upper table 31. The gripping member 31a engages with the guide rail 36b provided on the frame 36 shown in FIG. 2 and slides to guide the raising and lowering of the upper table 31. The vertical driving force of the upper table 31 is obtained by the first servomotor 60, and the rotational force of the first servomotor 60 is transmitted to the first ball screw 35 by the first timing belt 35c as shown in FIG. The upper table 31 is raised and lowered. A first pulley 35a is fixed to the end of the first ball screw 35. An upper die 37 is fixed to the lower surface of the upper table 31.

FIG. 5 shows a side sectional view of the upper die 37 and the lower die 33 in close proximity to each other. The upper die 37 and the lower die 33 in the figure are closer to each other than the retreat positions of the upper die 37 and the lower die 33. The lower mold 33 is configured to abut against the upper mold 37 with the resin molded sheet S sandwiched between them, and the upper mold 37 is provided with a sheet pressing portion 37a. The seat pressing portion 37a is engaged with the upper mold 37 via a spring 37b, and is guided by a shaft (not shown) arranged in the center of the spring 37b, so that the upper mold is as shown in FIG. 7D described later. When the 37 and the lower mold 33 come into contact with each other, the sheet pressing portion 37a is housed in the recess 37c provided in the upper mold 37.

[Explanation of operation]
Since the thermoforming apparatus 10 of the present embodiment has the above configuration, the resin molded sheet S is molded by the operation as described below. FIG. 6 shows a schematic configuration of control regarding the molded portion 30. A servomotor control unit 91, an input unit 94, and an output unit 95 are connected to the programmable logic controller (hereinafter referred to as PLC) 90. Further, the first servomotor 60 and the second servomotor 61 are connected to the servomotor control unit 91, respectively. Further, a first encoder 70 is connected to the first servomotor 60, a second encoder 71 is connected to the second servomotor 61, and the first encoder 70 and the second encoder 71 are connected to the PLC 90, respectively.

Here, the output unit 95 includes a display or the like provided on an operation panel (not shown), and displays a status such as an error. The input unit 94 includes buttons provided on an operation panel (not shown), and can input various data and the like. The operation panel is a touch panel system and does not prevent the input unit 94 and the output unit 95 from being combined. Further, the input unit 94 may be provided with a button for operation separately. Further, the servomotor control unit 91 drives and controls the first servomotor 60 and the second servomotor 61. In addition, although a device provided in the molding unit 30 is connected to the PLC 90, the description thereof is omitted because it is not directly related to the present invention.

7A to 7D schematically show how the resin molded sheet S is molded by the upper mold 37 and the lower mold 33. In FIG. 7A, the resin molded sheet S is pressed against the lower mold 33 by the sheet pressing portion 37a provided on the upper mold 37. The sheet pressing portion 37a is urged by a spring 37b, and the resin molded sheet S is fixed so as not to move due to the pressing force. At this time, one end of the resin molded sheet S is clamped by the transport device 50.

Then, as shown in FIG. 7B, the resin molded sheet S is deformed by advancing the upper mold 37 with respect to the lower mold 33. As shown in FIG. 7C, the closer the distance of the upper mold 37 to the lower mold 33 is, the more the spring 37b is compressed and the resin molded sheet S is continuously held. Then, as shown in FIG. 7D, the upper mold 37 and the lower mold 33 are advanced to a position where they are in close contact with each other via the resin molded sheet S, thereby pressurizing and deforming the resin molded sheet S. In this way, the resin molded sheet S is molded into the molded product M by the upper mold 37 and the lower mold 33.

[Explanation of action and effect]
Since the thermoforming apparatus 10 of the present embodiment has the above configuration, it exhibits the following actions and effects.

First, by pressing a specific portion of the resin molded sheet S with the sheet pressing portion 37a, which is a pressing means, and then molding, it is possible to make it difficult for strain to be accumulated inside the pressed portion. This is a thermoforming apparatus 10 provided with an upper mold 37 and a lower mold 33 as a molding mold and sandwiching a heated resin molding sheet S between the upper mold 37 and the lower mold 33, in which the upper mold 37 or the lower mold 33 is formed. A sheet pressing portion 37a, which is a pressing means provided so as to protrude from the molded surface on either one of the two, is provided, and the sheet pressing portion 37a becomes a part of the molded product M after molding in the resin molded sheet S. A specific portion (transparent portion M1 described later) is pressed so as to be sandwiched between the molding surface of the molding die on the other side (in the present embodiment, the lower surface of the sheet pressing portion 37a provided on the upper die 37 and the upper surface of the lower die 33 are pressed. (Holding so as to be sandwiched), the resin molded sheet S is formed by sandwiching the resin molded sheet S with the upper mold 37 and the lower mold 33 except for a specific portion.

8A to 8D are diagrams schematically showing how the resin molded sheet S is molded by the upper mold 137 and the lower mold 133 prepared for comparison. The resin molding sheet S is molded by the upper mold 137 and the lower mold 133. The upper mold 137 and the lower mold 133 play the same role as the upper mold 37 and the lower mold 33 of the present embodiment. The same applies to the point that one end is clamped by the moving device 150. The resin molded sheet S is molded by bringing the upper mold 137 and the lower mold 133 close to each other as in the present embodiment. However, as shown in FIG. 8B, the resin molded sheet S abuts on the upper die 137 at the point P1 and abuts on the lower die 133 at the point P3 to form a point P2 floating from the lower die 133.

Then, as shown in FIG. 8C, the number of points P4 at which the resin molding sheet S abuts on the lower mold 133 increases, resulting in the resin molding sheet S being molded with the upper mold 137 and the lower mold 133 in close proximity to each other. .. However, while the point P2 is further floated and crushed by the upper die 137 from above, the upper die 137 and the lower die 133 are close to each other in the state where the point P1 and the point P3 are in contact with each other first. As a result, a force that stretches the resin molded sheet S acts between the points P1 and P3, and a force that compresses the resin molded sheet S acts at the point P2. Of course, since the molding is performed in FIG. 8D, the result is that the molded product M having a uniform thickness is completed, but the strain is accumulated inside the molded product M.

On the other hand, in the case of the present invention, the resin molded sheet S is pressed against the lower mold 33 by the sheet pressing portion 37a as shown in FIGS. 7A to 7D before the upper mold 37 and the lower mold 33 are brought close to each other. FIG. 9 schematically shows a perspective view when molding a resin molded sheet using an upper mold and a lower mold. The molded product M is provided with a transparent portion M1. When the molded product M is used in the product, for example, a display screen is arranged behind the molded product M, so that the transparent portion M1 is provided. It becomes the window part.

In such a molded product M, the transparent portion M1 is first pressed against the lower mold 33 by the sheet pressing portion 37a, and the upper mold 37 is brought close to the lower mold 33 while being held (actually, the upper mold 37). The mold 37 is lowered by driving the first servomotor 60, and the lower mold 33 is raised by driving the second servomotor 61, so that the mold 37 is controlled to be close to each other). Then, as shown in FIG. 7D, the upper mold 37 and the lower mold 33 are brought into close contact with each other via the resin molding sheet S to form the molded product M.

By molding the molded product M in this way, the transparent portion M1 can be firmly held by applying pressure to the upper surface of the lower mold 33 at the sheet pressing portion 37a first, and FIGS. 7B and 7C And when the resin molded sheet S is deformed, the transparent portion M1 does not move. Therefore, the floating as shown at the point P2 as shown in FIGS. 8B and 8C cannot be performed. Therefore, the meat is molded without being pulled or wrinkled from the transparent portion M1, and when the state shown in FIG. 7D is reached, the transparent portion M1 is molded in a state where internal strain is not accumulated. It will be possible.

When such internal distortion occurs in the transparent portion M1, it is difficult to determine the presence or absence thereof only by visual inspection, but by arranging a light source on the back surface of the transparent portion M1, it can be visually recognized as interference fringes. For example, in the case where the transparent portion M1 is used as the window for displaying the display screen as described above, as mentioned in the problem, a portion that is difficult to see depending on the angle is formed due to the influence of the internal distortion.

In addition, as mentioned in the task, the internal strain is formed in a directional manner, so that it may exhibit polarization with respect to transmitted light. For example, when sunglasses using a polarized lens are used, it is transparent. A part of the display screen that can be seen through the portion M1 may appear as a defect. However, such a problem can be solved by molding with the upper mold 37 and the lower mold 33 in a state where the transparent portion M1 is pressed by the sheet pressing portion 37a.

Further, since the resin molded sheet S is molded in a state of being pressed by the sheet pressing portion 37a, even if the shape is such that air accumulation is likely to occur in this portion, the resin molded sheet S is pressed by the sheet pressing portion 37a. It is possible to prevent the formation of air pools. Therefore, it is possible to prevent the appearance from being deteriorated due to the generation of air pool. When the transparent portion M1 is used as a window when it is made into a product, it is possible to prevent an appearance defect due to the occurrence of air accumulation even if the structure is such that air accumulation is likely to occur in this portion.

Similarly, in a case where a hole is preliminarily formed in the portion of the resin molded sheet S to be pressed by the sheet pressing portion 37a, it is possible to avoid the influence that the hole portion is stretched and deformed or the size is changed. can. Further, when the sheet pressing portion 37a of the resin molded sheet S is printed in advance, it is possible to avoid the influence of the printed portion being displaced, stretched and deformed.

Further, since the thermoforming apparatus 10 performs position control or torque control, it is possible to control the clearance between the upper die 37 and the lower die 33 to an appropriate level. This includes a first servomotor 60 corresponding to a first drive mechanism for raising the upper die 37, a second servomotor 61 corresponding to a second drive mechanism for lowering the lower die 33, a first servomotor 60, and a first servomotor 60. 2 Servo motor control unit 91, which is a control device for controlling the servo motor 61, and controls the first servo motor 60 and the second servo motor 61 with the upper die 37 and the lower die 33 closed. This is because the position control or torque control is performed by the 91 to control the position of the lower die 33 with respect to the upper die 37.

In order to drive the upper table 31 and the lower table 32, the first servomotor 60 and the second servomotor 61 are used to drive while performing feedback control, respectively. The ball screw (first ball screw 35 and second ball screw 34) is rotated by the rotational drive of the servo motors (first servo motor 60 and second servo motor 61), and as a result, the upper table 31 and the lower table 32 are moved up and down. It is a structure that can be done. At this time, for example, in the case of the upper table 31, the first servomotor 60 can execute position control using the position of the upper table 31 as a feedback element and torque control using the generated torque as a feedback element. Similarly, position control and torque control can be performed on the lower table 32 as well.

As a result, position control or torque control can be performed at the time of mold clamping, and the clearance between the upper mold 37 and the lower mold 33 can be controlled. It may be desirable to change the mold clamping pressure depending on the thickness of the resin molded sheet S, the properties of the material, the heating conditions of the upper mold 37 and the lower mold 33, and the like. Although the resin molded sheet S is in a state of being preheated by the heating unit 20 and softened in advance, there are cases where springback occurs after the molding process. In such a case, by performing position control or torque control on the upper mold 37 and the lower mold 33, it is possible to contribute to improving the molding accuracy of the molded product M.

Then, in performing such position control, it is preferable to have a configuration in which the stop positions of the upper die 37 and the lower die 33 can be numerically input and set by the input unit 94. By doing so, when different molded products M are molded by the thermoforming apparatus 10, fine condition adjustment is possible depending on the characteristics of the resin molded sheet S and other conditions, and as a result, when the molded product M is completed. It leads to the improvement of molding accuracy. Of course, such numerical settings are stored by a storage means (not shown), and do not prevent the molded product M from being selected and changed.

Although the thermoforming apparatus 10 according to the present invention has been described above, the present invention is not limited to this, and various changes can be made without departing from the spirit of the present invention. For example, in the present embodiment, the seat pressing portion 37a is provided on the upper mold 37, but it may be better to provide the seat pressing portion 37a on the lower mold 33 depending on the place to be pressed, so that such a change is not hindered. Further, in the present embodiment, the spring 37b is provided between the upper die 37 and the seat pressing portion 37a to urge the resin molded sheet S. For example, an urging means using a cylinder or a motor may be used. It does not prevent the adoption of the used urging means. In this case, the upper die 37 (or the lower die 33) and the sheet pressing portion 37a may be separated from each other.

Further, regarding the method of moving the upper table 31 and the lower table 32, the ball screw (first ball screw 35 and second ball screw 34) is driven by the rotational drive of the servomotor (first servomotor 60 and second servomotor 61). The method is to be driven via a timing belt (first timing belt 35c and second timing belt 34c) which is a transmission means and a pulley or the like (first pulley 35a and second pulley 34a), but the method is limited to this. For example, it does not prevent the vehicle from being driven by using a gear or a cam as a power transmission means. Further, it does not prevent the cylinder and the crank mechanism from being used together for the mold clamping between the upper mold 37 and the lower mold 33.

Further, although the thermoforming apparatus 10 for driving the upper table 31 and the lower table 32 has been described, it is fixed on one side as necessary, that is, either the upper table 31 or the lower table 32 is fixed and only the other is driven. It may be a method.

10 Thermoforming device 33 Lower mold 37 Upper mold 37a Sheet pressing part S Resin molded sheet M Molded product

Claims

In a thermoforming apparatus having an upper mold and a lower mold as a molding mold and sandwiching a heated resin sheet between the upper mold and the lower mold.
It has a pressing means provided so as to protrude from the molding surface on either one of the upper mold and the lower mold.
The pressing means has a function of sandwiching a specific portion of the resin sheet, which is a part of the molded product after molding, with the molding surface of the molding mold on the other side.
The resin sheet is formed by sandwiching a portion other than the specific portion of the resin sheet between the upper mold and the lower mold.
A thermoforming device characterized by.
In the thermoforming apparatus according to claim 1,
The specific part is a transparent part when the resin sheet becomes a product.
A thermoforming device characterized by.
In the thermoforming apparatus according to claim 1 or 2.
A drive mechanism that raises and lowers at least one of the upper mold and the lower mold, and
A control device for controlling the drive mechanism is provided.
With the upper mold and the lower mold closed, position control or torque control is performed by a control device that controls the drive mechanism to control the position of the lower mold with respect to the upper mold.
A thermoforming device characterized by.
In the thermoforming apparatus according to claim 1,
The specific part is a part where air accumulation is likely to occur during molding.
A thermoforming device characterized by.
In a thermoforming method in which an upper mold and a lower mold are provided as molding molds, and a heated resin sheet is sandwiched between the upper mold and the lower mold.
A molded product of the resin sheet after molding, with a pressing means provided so as to protrude from the molding surface on either one of the upper mold and the lower mold, and the molding surface of the molding mold on the other side. By sandwiching a specific part that becomes a part of
Forming the resin sheet by sandwiching a portion other than the specific portion of the resin sheet between the upper mold and the lower mold.
A thermoforming method characterized by.